1558The plankton bucket is attached to the end of a plankton net. the plankton net is pulled through the water or water is poured through the net and the plankton is caught and concentrated in the bucket. the net mesh-size of the bucket determines the size of the plankton captured. the metal pin is inserted in the bucket when in use. the pin is removed and the bucket net washed with clean water to flush the plankton into a beaker.